From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- xpcom/tests/gtest/TestGCPostBarriers.cpp | 165 +++++++++++++++++++++++++++++++ 1 file changed, 165 insertions(+) create mode 100644 xpcom/tests/gtest/TestGCPostBarriers.cpp (limited to 'xpcom/tests/gtest/TestGCPostBarriers.cpp') diff --git a/xpcom/tests/gtest/TestGCPostBarriers.cpp b/xpcom/tests/gtest/TestGCPostBarriers.cpp new file mode 100644 index 0000000000..c32cd48c86 --- /dev/null +++ b/xpcom/tests/gtest/TestGCPostBarriers.cpp @@ -0,0 +1,165 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* + * Tests that generational garbage collection post-barriers are correctly + * implemented for nsTArrays that contain JavaScript Values. + */ + +#include "mozilla/UniquePtr.h" + +#include "jsapi.h" +#include "nsTArray.h" + +#include "gtest/gtest.h" + +#include "js/PropertyAndElement.h" // JS_GetProperty, JS_SetProperty +#include "js/TracingAPI.h" +#include "js/HeapAPI.h" + +#include "mozilla/CycleCollectedJSContext.h" + +using namespace mozilla; + +template +static void TraceArray(JSTracer* trc, void* data) { + ArrayT* array = static_cast(data); + for (unsigned i = 0; i < array->Length(); ++i) { + JS::TraceEdge(trc, &array->ElementAt(i), "array-element"); + } +} + +/* + * Use arrays with initial size much smaller than the final number of elements + * to test that moving Heap elements works correctly. + */ +const size_t ElementCount = 100; +const size_t InitialElements = ElementCount / 10; + +template +static void TestGrow(JSContext* cx) { + JS_GC(cx); + + auto array = MakeUnique(); + ASSERT_TRUE(array != nullptr); + + JS_AddExtraGCRootsTracer(cx, TraceArray, array.get()); + + /* + * Create the array and fill it with new JS objects. With GGC these will be + * allocated in the nursery. + */ + JS::RootedValue value(cx); + const char* property = "foo"; + for (size_t i = 0; i < ElementCount; ++i) { + JS::RootedObject obj(cx, JS_NewPlainObject(cx)); + ASSERT_FALSE(JS::ObjectIsTenured(obj)); + value = JS::Int32Value(static_cast(i)); + ASSERT_TRUE(JS_SetProperty(cx, obj, property, value)); + ASSERT_TRUE(array->AppendElement(obj, fallible)); + } + + /* + * If postbarriers are not working, we will crash here when we try to mark + * objects that have been moved to the tenured heap. + */ + JS_GC(cx); + + /* + * Sanity check that our array contains what we expect. + */ + ASSERT_EQ(array->Length(), ElementCount); + for (size_t i = 0; i < array->Length(); i++) { + JS::RootedObject obj(cx, array->ElementAt(i)); + ASSERT_TRUE(JS::ObjectIsTenured(obj)); + ASSERT_TRUE(JS_GetProperty(cx, obj, property, &value)); + ASSERT_TRUE(value.isInt32()); + ASSERT_EQ(static_cast(i), value.toInt32()); + } + + JS_RemoveExtraGCRootsTracer(cx, TraceArray, array.get()); +} + +template +static void TestShrink(JSContext* cx) { + JS_GC(cx); + + auto array = MakeUnique(); + ASSERT_TRUE(array != nullptr); + + JS_AddExtraGCRootsTracer(cx, TraceArray, array.get()); + + /* + * Create the array and fill it with new JS objects. With GGC these will be + * allocated in the nursery. + */ + JS::RootedValue value(cx); + const char* property = "foo"; + for (size_t i = 0; i < ElementCount; ++i) { + JS::RootedObject obj(cx, JS_NewPlainObject(cx)); + ASSERT_FALSE(JS::ObjectIsTenured(obj)); + value = JS::Int32Value(static_cast(i)); + ASSERT_TRUE(JS_SetProperty(cx, obj, property, value)); + ASSERT_TRUE(array->AppendElement(obj, fallible)); + } + + /* Shrink and compact the array */ + array->RemoveElementsAt(InitialElements, ElementCount - InitialElements); + array->Compact(); + + JS_GC(cx); + + ASSERT_EQ(array->Length(), InitialElements); + for (size_t i = 0; i < array->Length(); i++) { + JS::RootedObject obj(cx, array->ElementAt(i)); + ASSERT_TRUE(JS::ObjectIsTenured(obj)); + ASSERT_TRUE(JS_GetProperty(cx, obj, property, &value)); + ASSERT_TRUE(value.isInt32()); + ASSERT_EQ(static_cast(i), value.toInt32()); + } + + JS_RemoveExtraGCRootsTracer(cx, TraceArray, array.get()); +} + +template +static void TestArrayType(JSContext* cx) { + TestGrow(cx); + TestShrink(cx); +} + +static void CreateGlobalAndRunTest(JSContext* cx) { + static const JSClass GlobalClass = {"global", JSCLASS_GLOBAL_FLAGS, + &JS::DefaultGlobalClassOps}; + + JS::RealmOptions options; + // dummy + options.behaviors().setReduceTimerPrecisionCallerType( + JS::RTPCallerTypeToken{0}); + JS::PersistentRootedObject global(cx); + global = JS_NewGlobalObject(cx, &GlobalClass, nullptr, + JS::FireOnNewGlobalHook, options); + ASSERT_TRUE(global != nullptr); + + JS::Realm* oldRealm = JS::EnterRealm(cx, global); + + using ElementT = JS::Heap; + + TestArrayType>(cx); + TestArrayType>(cx); + TestArrayType>(cx); + + JS::LeaveRealm(cx, oldRealm); +} + +TEST(GCPostBarriers, nsTArray) +{ + CycleCollectedJSContext* ccjscx = CycleCollectedJSContext::Get(); + ASSERT_TRUE(ccjscx != nullptr); + JSContext* cx = ccjscx->Context(); + ASSERT_TRUE(cx != nullptr); + + CreateGlobalAndRunTest(cx); +} -- cgit v1.2.3